ナショナルジオグラフィックさんのインスタグラム写真 - (ナショナルジオグラフィックInstagram)「Photo by David Chancellor @chancellordavid / Lion under red light, Ol Kinyei Conservancy, Masai Mara, Kenya. For tracking wildlife after dark in the bush, many of the trackers I work with use a simple combination of the color of the eyeshine and the height of the eyes and their width apart, markers that immediately identify the species in the absence of seeing the animal itself. The eyeshine is caused by a reflective layer behind the retina called the tapetum lucid, which sends light back through the retina, increasing the light available to be captured in an image. Animals that possess these layers, such as lions, have far better nocturnal vision than those that don’t—for example, us. It's this reflected light that causes eyeshine and allows us to track them with artificial light. To see more follow me @chancellordavid @ewasolions @porinicamps #masaimara #kenya #lion #africa #communityconservation」10月15日 15時39分